Re-Volt: /Users/frarees/Desktop/rv1/source/inc/grid.h Source File

00001 /*********************************************************************************************
00002  *
00003  * grid.h
00004  *
00005  * Re-Volt (Generic) Copyright (c) Probe Entertainment 1998
00006  * 
00007  * Contents:
00008  *      Object and AI node grid system, incorporating object test mark-off system.
00009  *
00010  *********************************************************************************************
00011  *
00012  * 22/07/98 MTaylor
00013  *  File inception.
00014  *
00015  *********************************************************************************************/
00016 
00017 #ifndef _GRID_H_
00018 #define _GRID_H_
00019 
00020 //
00021 // Defines and macros
00022 //
00023 
00024 #define MAX_GRIDS     4                 // Number of grids used by the system (must be factor of 2)
00025 #define MAX_SHIFTS      2                 // Number of times the grid is "shifted" (offset) on each axis
00026 
00027 #define OBJ_GRID_WIDTH    32                  // X and Y width of each grid
00028 #define OBJ_GRID_SIZE   (OBJ_GRID_WIDTH * OBJ_GRID_WIDTH) // Number of grid units making up entire grid
00029 #define OBJ_UNIT_SIZE   (65536 / OBJ_GRID_WIDTH)        // Size in world units of one side of a grid square
00030 #define OBJ_SHIFT_OFFSET  (OBJ_UNIT_SIZE / MAX_SHIFTS)    // Amount added to grid centre for each shift
00031 
00032 #define NODE_GRID_WIDTH   32                  // X and Y width of each grid
00033 #define NODE_GRID_SIZE    (NODE_GRID_WIDTH * NODE_GRID_WIDTH) // Number of grid units making up entire grid
00034 #define NODE_UNIT_SIZE    (65536 / NODE_GRID_WIDTH)       // Size in world units of one side of a grid square
00035 #define NODE_SHIFT_OFFSET (NODE_UNIT_SIZE / MAX_SHIFTS)   // Amount added to grid centre for each shift
00036 
00037 
00038 //
00039 // Typedefs and structures
00040 //
00041 
00042 typedef struct _OBJGRIDUNIT
00043 {
00044   struct object_def *ObjHead;
00045 } OBJGRIDUNIT;
00046 
00047 
00048 typedef struct _NODEGRIDUNIT
00049 {
00050   struct _AINODE    *NodeHead;
00051 } NODEGRIDUNIT;
00052 
00053 
00054 //
00055 // External global variables
00056 //
00057 
00058 extern OBJGRIDUNIT  *ObjGrid[MAX_GRIDS];
00059 extern NODEGRIDUNIT *NodeGrid[MAX_GRIDS];
00060 
00061 //
00062 // External function prototypes
00063 //
00064 
00065 extern long GRD_AllocGrids(void);
00066 extern void GRD_FreeGrids(void);
00067 extern void GRD_UpdateObjGrid(void);
00068 extern void GRD_RemoveObject(struct object_def *Obj);
00069 extern void GRD_ResetObjPairs(void);
00070 extern long GRD_ObjectPair(struct object_def *Obj1, struct object_def *Obj2);
00071 extern void GRD_GridNodes(struct _AINODE *Src, long Num);
00072 
00073 #endif